Why Are My Pear Tree Branches Dying Back?

Branch dieback in pear trees — where the tips of shoots or entire limbs wilt, turn brown, and die — is one of the most alarming symptoms you can see in the orchard. The speed at which it happens and the appearance of the dead wood gives you the clearest clues about the cause. Fast, dramatic dieback in summer points in a very different direction from the slow tip death you might find in early spring.

Fireblight — fast, dramatic dieback

Fireblight is the most serious cause of rapid branch dieback in pear trees. Infected shoots wilt suddenly in summer, the leaves turn dark brown or black and remain hanging on the branch rather than falling, and the shoot tip curves into the distinctive shepherd's crook. Cut through a dying branch and the wood beneath shows reddish-brown staining extending back into healthy tissue. Fireblight enters through blossom in spring — insects and rain splash carry the bacteria from flower to flower. There is no chemical cure. Cut infected wood at least 30 cm back into clean, unaffected wood; sterilise your tools between every single cut. Bag and burn all removed material immediately.

Canker — slower, spreading lesions

Pear canker (Neonectria galligena) kills branches more slowly. You will see a sunken, discoloured, flaking canker on the bark surface, usually centred on an old wound. The canker girdles the branch progressively — when it has encircled the full circumference, the wood beyond it dies back. Small branches and spurs can be completely killed by a single canker. Cut out all affected wood generously back into healthy tissue. Canker thrives in wet sites and on trees with poor air circulation; open up the canopy with pruning and improve drainage around the roots.

Frost damage to young wood

Late frosts in spring can kill off the soft growing tips of pear shoots, particularly on early-leafing varieties. Affected tips become limp, turn brown and die back a short distance — usually only a few centimetres. The die-back is superficial and the tree quickly produces new lateral growth from buds just behind the dead section. Simply remove dead tips back to healthy green wood after the risk of frost has passed. Planting in a sheltered site with good air drainage significantly reduces frost damage.

Drought stress in summer

Young or newly planted pear trees can show dieback at shoot tips during hot, dry summers if their root systems are not yet extensive enough to supply the whole canopy with water. Older trees on shallow soils are also vulnerable in drought conditions. Mulching around the root zone with a thick layer of compost or wood chip significantly reduces moisture loss from the soil. Water deeply during prolonged dry spells rather than giving shallow frequent waterings that only wet the surface.